yes but I'm registered as a "super user" so logically it shouldn't work
– JinSnowJul 8 '14 at 15:59

I'm not sure I understand, if you simply want to remove the editing icon for this module then the method I mentioned above should work. You can change the access control levels for each user group even super users. Let me know If I am way off and I'll try help!
– jonboyJul 8 '14 at 18:58

when I set all the super user parameters to my "switch langage" module to "denied" it change nothing: I can still front end edit this module. That's weird...
– JinSnowJul 10 '14 at 8:33

Try create a new user group and see if the changes take effect. Also, take a look at Advanced Module Manager (nonumber.nl/extensions/advancedmodulemanager), you can set all sorts of custom permissions here which may help you work around your issue.
– jonboyJul 10 '14 at 10:35